<!DOCTYPE html>
<!-- 侧边栏的测试 -->
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        a {
            display: block;
            background-color: #55585a;
            width: 200px;
            height:40px;
            text-decoration: none;
            color: rgb(235, 230, 230);
            font-family: 'Times New Roman', Times, serif;
            line-height: 40px;
            text-indent:2em;


        }

        a:hover {
            background-color: darkorange;
        }
    </style>
</head>

<body>
    <div>
        <a href="#" >开始 </a>
        <a href="#">第一个</a>
        <a href="#">第二个</a>
        <a href="#">第三个</a>
    </div>
</body>

</html>